V18: Discount resets to 0 when changing quantity on sales order line

Question

Hello,
I am experiencing an issue on *Odoo v18* (Enterprise, Odoo.sh).
When I set a *discount (%)* on a sales order line and then modify only the *quantity*, the discount is automatically reset to *0*.
*Steps to reproduce:*

Create a quotation

Add a product

Enter a discount (e.g. 10%)

Save

Change only the quantity on the same line
Result: the discount is reset to 0
Expected: the discount should remain unchanged if only the quantity is modified
This behavior is problematic for our users, as t

Codesphere Tech · Accepted Answer

Hello,
It is due to *Pricelist *on Sale order.
*Method*: def _compute_discount(self):
*Explanation:*
When you change a *Quantity*, Odoo automatically re-calculates the line to check if the *Pricelist* has a specific rule for that new amount. Since your manual discount isn't a "rule" in the Pricelist, Odoo resets the field to *0%* to match its official records.
Hope this helps
Thanks
*info@codespheretech.in*

Jainesh Shah(Aktiv Software) · Answer

Hello Benjamin Waroquier,
This behavior usually occurs due to the *Pricelist* configuration.
When a *Pricelist* is applied to the Sales Order, Odoo recalculates the price and discount based on the pricelist rules whenever you modify certain fields like *quantity*. As a result, the manually entered discount gets reset and replaced by the discount defined in the pricelist.
However, if *no pricelist is applied*, Odoo will *keep the manually entered discount unchanged* when you modify the quantity.

Cybrosys Techno Solutions Pvt.Ltd · Answer

Hi,
Changing the quantity on a sale order line triggers the product_id_change onchange method, which recomputes the unit price and the discount based on the pricelist rules for the new quantity. This is by design in Odoo's core because pricelist rules can be quantity-dependent (e.g., 10% discount for qty > 10). However, the side effect is that any manually entered discount is wiped out, which is the problem you are hitting.
Workarounds and fixes: Option 1 — OCA Module (cleanest, no heavy customi

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